Can I use an existing conservatory footing to replace it with a single storey extension?

It would be my opinion that it is unlikely that the foundations will be suitable to build an extension on, but as ever in life there are exceptions to the rule. In any event, if you propose to build an extension, you will need the building inspector's approval, so that would be my starting point. dig down, expose the foundation to indicate its size and depth and call building control to request they have a look. Guy Clark gclarkitecture

Hi Kev, I've just recently completed similar project - I've built a sun-lounge on the existing footing of a conservatory. We did not have to provide a new foundation but we had to reveal the existing footing in three places prior to start and provide structural calculations. The calculations demonstrated that the new extension would not weight more than the removed conservatory. The conservatory had few courses of brickwork which was also removed and had massive heavy double glazed panels. And the new extension is a light timber frame construction with many windows. Building control inspector will be needed anyway. Hope it helps. Andre.